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CVE-2026-71920

MEDIUMCVSS 4.9/10EPSS 0.39%

Last modified

CVE-2026-71920 is a medium-severity vulnerability rated 4.9/10 on the CVSS scale. Multiple DrayTek VigorSwitch models contain a null pointer dereference vulnerability in the formlogout function. The vulnerability is caused by missing checks for an empty or absent Cookie header before string handling. EPSS estimates a 0.39% chance of exploitation in the next 30 days.

Description

Multiple DrayTek VigorSwitch models contain a null pointer dereference vulnerability in the formlogout function. The vulnerability is caused by missing checks for an empty or absent Cookie header before string handling. A remote attacker can trigger this vulnerability via a crafted request to crash the service and cause a denial of service. Exploitation requires valid administrative credentials for the device's web management interface.

Metrics

CVSS 3.1
4.9/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS 4.0
6.9/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability
0.39%

32.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
DrayTek CorporationVigorSwitch G2540xs< 3.9.10
DrayTek CorporationVigorSwitch P2540xs< 3.9.10
DrayTek CorporationVigorSwitch FX2120< 3.9.10
DrayTek CorporationVigorSwitch G2282x< 2.10.6
DrayTek CorporationVigorSwitch P2282x< 2.10.6
DrayTek CorporationVigorSwitch Q2300x< 2.10.7
DrayTek CorporationVigorSwitch PQ2300xb< 2.10.7
DrayTek CorporationVigorSwitch G2542x< 3.10.6
DrayTek CorporationVigorSwitch P2542x< 3.10.6
DrayTek CorporationVigorSwitch P2542xh< 3.10.6
DrayTek CorporationVigorSwitch PX2060< 2.9.10
DrayTek CorporationVigorSwitch G1280< 2.9.10
DrayTek CorporationVigorSwitch P1280< 2.9.10
DrayTek CorporationVigorSwitch P1281x< 2.9.10
DrayTek CorporationVigorSwitch G1282< 2.9.10
DrayTek CorporationVigorSwitch P1282< 2.9.10
DrayTek CorporationVigorSwitch G2121< 2.9.10
DrayTek CorporationVigorSwitch P2121< 2.9.10
DrayTek CorporationVigorSwitch PQ2121x< 2.9.10
DrayTek CorporationVigorSwitch Q2121x< 2.9.10
DrayTek CorporationVigorSwitch G2280x< 2.9.10
DrayTek CorporationVigorSwitch P2280x< 2.9.10
DrayTek CorporationVigorSwitch Q2200x< 2.9.10
DrayTek CorporationVigorSwitch PQ2200xb< 2.9.10
DrayTek CorporationVigorSwitch G2100< 2.9.10
DrayTek CorporationVigorSwitch P2100< 2.9.10
DrayTek CorporationVigorSwitch G2540x< 2.9.10
DrayTek CorporationVigorSwitch P2540x< 2.9.10

References

Timeline

Published
Last Modified
Status
Deferred

Frequently Asked Questions

What is CVE-2026-71920?
Multiple DrayTek VigorSwitch models contain a null pointer dereference vulnerability in the formlogout function. The vulnerability is caused by missing checks for an empty or absent Cookie header before string handling. A remote attacker can trigger this vulnerability via a crafted request to crash the service and cause a denial of service. Exploitation requires valid administrative credentials for the device's web management interface.
How severe is CVE-2026-71920?
CVE-2026-71920 has a CVSS score of 4.9/10 (MEDIUM severity). The EPSS model estimates a 0.39% probability of exploitation in the next 30 days.
How do I fix CVE-2026-71920?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST